颤振应用未连接到Firestore并在build.gradle中显示错误，它因ASCII异常而崩溃

Question

我一直试图将Firebase连接到我的flutter应用程序，但是当我执行gradle构建失败并且显示ASCII错误apperead的错误时。

应用程序级别buil.gradle无法将Properties类解析为gradleException类enter image description here

我的build.gradle文件，但无法解析属性和gradleException。

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
    localProperties.load(reader)
}
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
   if (flutterRoot == null) {
   throw new GradleException`("Flutter SDK not found. Define location 
 with flutter.sdk in the local.properties file.")
 }

def flutterVersionCode = 
   localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
   flutterVersionCode = '1'
}

def flutterVersionName = 
  localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
  flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'

应用插件：“ kotlin-android” 适用于：“ $ flutterRoot / packages / flutter_tools / gradle / flutter.gradle”

android {     compileSdkVersion 28

sourceSets {
    main.java.srcDirs += 'src/main/kotlin'
}

lintOptions {
    disable 'InvalidPackage'
}

defaultConfig {
    // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
    applicationId "com.example.chat"
    minSdkVersion 16
    targetSdkVersion 28
    versionCode flutterVersionCode.toInteger()
    versionName flutterVersionName
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}

buildTypes {
    release {
        // TODO: Add your own signing config for the release build.
        // Signing with the debug keys for now, so `flutter run --release` works.
        signingConfig signingConfigs.debug
    }
}

}

颤抖{     资源 '../..' }

依赖项{     实现“ org.jetbrains.kotlin：kotlin-stdlib-jdk7：$ kotlin_version”     testImplementation'junit：junit：4.12'     androidTestImplementation'com.android.support.test：runner：1.0.2'     androidTestImplementation'com.android.support.test.espresso：espresso-core：3.0.2' } 应用插件：“ com.google.gms.google-services”